fix(simply-package): sort package aliases in dependencies manage

[ClayChipps]

Summary

• `sf simply package dependencies manage` now writes `packageAliases` in `sfdx-project.json` sorted alphabetically by key, instead of leaving newly added/updated aliases in insertion order.
• Sorting happens right before the write in `applyChanges` (`sfdxProjectService.ts`).

Test plan

• Added a unit test in `sfdxProjectService.test.ts` asserting written `packageAliases` keys come out sorted.
• `npx vitest run` for `simply-package`'s `sfdxProjectService` and `dependencies/manage` test files — all passing.
• `npx tsc --noEmit` and `eslint` on changed files — clean.

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com

https://claude.ai/code/session_014oTGUGohBiqrzETHCs25AB